then it sends me back to the menu where I can choose either to install the base system again or proceed without installing it.

The same thing happened when I tried to install Xubntu 12.04 alternate on the laptop. Although I can install the Xubuntu using the Normal iso (GUI installation) with no problems !

I used md5sum and there were no errors. Searched the internet and I found the same error but with a different package corrupted. Tried their solution which basically choosing ext3 instead of ext4 and still no hope.

Do you think it is because of the Usb ? I mean should I use a CD instead ?